NAIROBI, Kenya, Dhu Al-Qa'dah 25, 1435, Sep 20, 2014, SPA -- Kenya's police chief is asking residents to be "extra vigilant" of attacks in the week following Sunday's anniversary of the Westgate Mall attack, AP reported. David Kimaiyo said Saturday police have doubled patrols across the country and asked entertainment facilities to continuously review and update security arrangements. Al-Shabab militants from Somalia claimed responsibility for the Sept. 21 Westgate Mall attack that left 67 people dead. --SPA 15:03 LOCAL TIME 12:03 GMT www.spa.gov.sa/w